Technical Design Report Super Fragment Separator

DRAFT
o A liquefaction power of 5 g/s liquid helium is required for cooling the current leads.
• Transfer lines
o To supply the magnet feedboxes with helium @ 4K, 3 m flexible, vacuum insulated,
double coaxial lines for forward and return flow are necessary for each feed box.
o To supply shield cooling @ 50K, two 3 m flexible, vacuum insulated, single coaxial
lines are necessary for each feed box, and
o a fixed multiple distribution line
• Feedboxes – each box contains the following components:
Power Converters
o support for an anti-cryostat
o cold Coriolis mass flow meters (max. 5g/s for SIS100; max. 200g/s for SIS300)
o current leads for main magnets and correctors
o helium supply (forward and return)
o 4 temperature and 4 pressure sensors
o temperature control units for the current leads and for the anti-cryostat
o The feedboxes for the SIS100-type magnets have to be equipped with a
Joule-Thomson expansion valve to produce two-phase helium.
For magnetic measurements of Super-FRS dipole and multiplet magnets a switch mode power
converter with a rated load current of 1000A and a maximum load voltage of 400V will be installed.
These will have to provide a current stablity of better than 10 -4 . A switch mode power converter
with a rated load current of 500A and a maximum load voltage of 400V will be foreseen to measure
Super-FRS correctors.
Quench Detection and Magnet Protection
Although most single magnets (except SIS300 dipole and quadrupole) are self-protecting, a protection
system allows minimizing the recovery time (necessary for cool down) after a quench
occurred due to the possibility of energy extraction. The voltage taps are isolated wires soldered to
the magnet cable. Voltage differences between two symmetric coil parts of the magnet are measured.
In addition an unbalanced current through a centre tap is measured. The scheme of functionality
is shown in Figure 2.4.162. The main components are the separated voltage detection, the
security matrix for safety actions and triggering the data acquisition, and a data acquisition system
for storage. The security matrix triggers the following safety actions:
• switch off the power converter which will switch a dump resistor into the coil circuit for
energy extraction
• open the active quench valve in the feedbox
• activate the quench heaters for magnets, if applicable (6 quadrupoles)
The planned test facility is based on the setup of a Prototype Test Facility which is ready for operation
since 2006 [118]. Due to large number of magnets a fully automated operation of the whole
test facility is necessary to achieve the required throughput.
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